diff options
| author | Athanasios Oikonomou <athoik@gmail.com> | 2017-12-16 07:23:38 -0500 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-12-19 07:08:12 -0500 |
| commit | f9d79126195374c285035777b9d6abd24ceba363 (patch) | |
| tree | 8ea97f93e3c1fb7d889f538e611b2eae8860d2a7 /drivers/media/dvb-core/dvb_frontend.c | |
| parent | 2453887924c0c0b07927c864f605e61995384949 (diff) | |
media: dvb_frontend: add physical layer scrambling support
This commit adds a new property DTV_SCRAMBLING_SEQUENCE_INDEX.
This 18 bit field, when present, carries the index of the DVB-S2 physical
layer scrambling sequence as defined in clause 5.5.4 of EN 302 307.
There is no explicit signalling method to convey scrambling sequence index
to the receiver. If S2 satellite delivery system descriptor is available
it can be used to read the scrambling sequence index (EN 300 468 table 41).
By default, gold scrambling sequence index 0 is used. The valid scrambling
sequence index range is from 0 to 262142.
Increase the DVB API version in order userspace to be aware of the changes.
Signed-off-by: Athanasios Oikonomou <athoik@gmail.com>
Acked-by: Ralph Metzler <rjkm@metzlerbros.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/dvb-core/dvb_frontend.c')
| -rw-r--r-- | drivers/media/dvb-core/dvb_frontend.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index ee3ea4dcd9c1..5547b9830bbc 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -982,6 +982,7 @@ static int dvb_frontend_clear_cache(struct dvb_frontend *fe) } c->stream_id = NO_STREAM_ID_FILTER; + c->scrambling_sequence_index = 0;/* default sequence */ switch (c->delivery_system) { case SYS_DVBS: @@ -1072,6 +1073,7 @@ static struct dtv_cmds_h dtv_cmds[DTV_MAX_COMMAND + 1] = { _DTV_CMD(DTV_STREAM_ID, 1, 0), _DTV_CMD(DTV_DVBT2_PLP_ID_LEGACY, 1, 0), + _DTV_CMD(DTV_SCRAMBLING_SEQUENCE_INDEX, 1, 0), _DTV_CMD(DTV_LNA, 1, 0), /* Get */ @@ -1417,6 +1419,11 @@ static int dtv_property_process_get(struct dvb_frontend *fe, tvp->u.data = c->stream_id; break; + /* Physical layer scrambling support */ + case DTV_SCRAMBLING_SEQUENCE_INDEX: + tvp->u.data = c->scrambling_sequence_index; + break; + /* ATSC-MH */ case DTV_ATSCMH_FIC_VER: tvp->u.data = fe->dtv_property_cache.atscmh_fic_ver; @@ -1900,6 +1907,11 @@ static int dtv_property_process_set(struct dvb_frontend *fe, c->stream_id = data; break; + /* Physical layer scrambling support */ + case DTV_SCRAMBLING_SEQUENCE_INDEX: + c->scrambling_sequence_index = data; + break; + /* ATSC-MH */ case DTV_ATSCMH_PARADE_ID: fe->dtv_property_cache.atscmh_parade_id = data; |